<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>定时跳转</title>
    <style>
        body{background:gray;}
        div{margin:20px auto;width:350px;height:150px;border:1px solid  rgb(0, 0, 0);background:rgb(255, 255, 255);padding:10px;}
        h2{text-align:center;}
        span{font-size:150%;color:rgb(187, 255, 0);margin:0 10px;}
      </style>
</head>
<body>
    <div>
        <h2>提交成功</h2>
        <a href="http://www.example.com">
          <span id="seconds">3</span>秒后系统会自动跳转，也可单击此链接跳转
        </a>
      </div>
      <script>
        function timing(secs, url) {
          var seconds = document.getElementById('seconds');
          seconds.innerHTML = --secs;
          if (secs > 0) {
            setTimeout('timing(' + secs + ', \'' + url + '\')', 1000);
          } else {
            location.href = url;
          }
        };
        timing(3, 'http://www.example.com');
      </script>
       <p><a href="第六章.html">返回上一级</a></p>
</body>
</html>